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      Construction of Realistic Standard--like Models in the Free Fermionic Superstring Formulation

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          Abstract

          I discuss in detail the construction of realistic superstring standard--like models in the four dimensional free fermionic formulation. The analysis results in a restricted class of models with unique characteristics: (i) Three and only three generations of chiral fermions with their superpartners and the correct Standard Model quantum numbers. (ii) Proton decay from dimension four and dimension five operators is suppressed due to gauged \(U(1)\) symmetries. (iii) There exist Higgs doublets from two distinct sectors, which can generate realistic symmetry breaking. (iv) These models explain the top--bottom mass hierarchy. At the trilinear level of the superpotential only the top quark gets a non vanishing mass term. The bottom quark and the lighter quarks and leptons get their mass terms from non renormalizable terms. This result is correlated with the requirement of a supersymmetric vacuum at the Planck scale. (v) The models predict the existence of small hidden gauge groups, like \(SU(3)\), with matter spectrum in vector representations.

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          Author and article information

          Journal
          09 August 1992
          Article
          10.1016/0550-3213(92)90160-D
          hep-th/9208024
          3317a3d9-1b55-4d14-822f-7a08c8ae01c1
          History
          Custom metadata
          WIS-92/16/FEB-PH
          Nucl.Phys. B387 (1992) 239-262
          28 pages
          hep-th hep-ph

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